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JOURNAL ARTICLE
VALIDATION STUDIES
Two selective HPTLC methods for determination of some angiotensin II receptor antagonists in tablets and biological fluids.
Biomedical Chromatography : BMC 2017 July
Two simple, selective, precise and highly sensitive high-performance thin-layer chromatography (HPTLC) methods have been developed and validated for analysis of five angiotensin II receptor antagonists, namely losartan, irbesartan valsartan, candesartan and olmesartan, which are widely used in clinical practice. HPTLC of the drugs was performed on pre-coated silica gel HPTLC plates 60 F254 by development using a mobile phase composed of chloroform-acetone-glacial acetic acid (7.8:1.5:0.7m v/v/v), which was suitable for all of the studied drugs. The first method depended on utilizing reflectance/fluorescence mode for detection while the second method depended on using 2,3,5,6-tetrachloro-1,4-benzoquinone as spraying reagent for the first time to form orange spots scanned at 460 nm. A good linear relationship was obtained over the concentration ranges of 1.2-60 and 360-3000 ng/band while detection and quantification limits were in the ranges of 0.07-0.43, 45.2-140.49 and 0.21-1.29, 137.05-425.74 ng/band for reflectance/fluorescence and reflectance/absorbance methods respectively. The developed methods were applied successfully for their determination in tablets and spiked human plasma for reflectance/fluorescence method with good accuracy and precision, and so can be applied in the pharmacokinetic and bioavailability studies.
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